用钱德拉和XMM-牛顿I观测到的RS蛇夫座的SSS相位：数据和初步建模
The SSS phase of RS Ophiuchi observed with Chandra and XMM-Newton I.: Data and preliminary Modeling
摘要：
超软源（SSS）发射的第六次记录爆发的经常性新星RS Oph的阶段被观察到两次与钱德拉和一次与XMM牛顿。在爆发后第39.7、54.0和66.9天进行观察。我们确认在第54.0天有一个35秒的周期，并发现它来自SSS发射，而不是来自冲击。我们讨论了中性元素在视线中的束缚-自由吸收，共振吸收线加上自吸收发射线成分，碰撞激发的发射线从冲击，He类系间线，和光谱变化期间的一个插曲的高振幅的变化。我们发现氧K壳层吸收边的降低可以用氧的光电离来解释。吸收分量在第39.7天的平均速度为-1286+-267 km/s，在第66.9天的平均速度为-771+-65 km/s。的发射线组件的波长是一致的，其休息波长证实了非自吸收氦类系间线的测量。我们有证据表明，这些线起源于冲击，而不是外层的流出，可能是光激发除了碰撞激发。我们发现碰撞激发的发射线，在波长小于15埃，起源于辐射冷却冲击衰落。在第39.5天，我们发现这些谱线的系统性蓝移为-526+-114 km/s。我们发现了异常的He样的f/i比，这表明要么高密度或显着的紫外辐射附近的等离子体的发射线形成。在强可变性阶段期间，当移动1000秒时，光谱硬度光变曲线覆盖总光变曲线。这可以用中性氧在视线中的光电离来解释，如果密度为10^{10}-10 ^<$11} cm^{-3}量级。
英文摘要：
The phase of Super-Soft-Source (SSS) emission of the sixth recorded outburst of the recurrent nova RS Oph was observed twice with Chandra and once with XMM-Newton. The observations were taken on days 39.7, 54.0, and 66.9 after outburst. We confirm a 35-sec period on day 54.0 and found that it originates from the SSS emission and not from the shock. We discus the bound-free absorption by neutral elements in the line of sight, resonance absorption lines plus self-absorbed emission line components, collisionally excited emission lines from the shock, He-like intersystem lines, and spectral changes during an episode of high-amplitude variability. We find a decrease of the oxygen K-shell absorption edge that can be explained by photoionization of oxygen. The absorption component has average velocities of -1286+-267 km/s on day 39.7 and of -771+-65 km/s on day 66.9. The wavelengths of the emission line components are consistent with their rest wavelengths as confirmed by measurements of non-self absorbed He-like intersystem lines. We have evidence that these lines originate from the shock rather than the outer layers of the outflow and may be photoexcited in addition to collisional excitations. We found collisionally excited emission lines that are fading at wavelengths shorter than 15A that originate from the radiatively cooling shock. On day 39.5 we find a systematic blue shift of -526+-114 km/s from these lines. We found anomalous He-like f/i ratios which indicates either high densities or significant UV radiation near the plasma where the emission lines are formed. During the phase of strong variability the spectral hardness light curve overlies the total light curve when shifted by 1000sec. This can be explained by photoionization of neutral oxygen in the line of sight if the densities of order 10^{10}-10^{11} cm^{-3}.
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